The first question asks who sold more rolls. So start with figuring out how many Christie sold.
5 total - 1 2/3 left = 3 1/3 sold
you can convert the numbers to improper fractions with the same denominator. Like this:
5 x (3/3) - (3+2)/3
15/3 - 5/3 = 10/3
10/3 = 3 1/3
So now we know Christie sold more because 3 1/3 dozen is more than 2 1/2 dozen.
The part asks how many more.. Subtract the amounts the two girls sold.
3 1/3 - 2 1/2
10/3 x (2/2) - 5/2 x (3/3)
20/6 - 15/6 = 5/6
Christie sold 5/6 dozen more rolls. A dozen is 12 rolls so if you wanted to go further you just multiply 12 x 5/6 = 10 rolls
Answer:
Its 384 cm
Step-by-step explanation:
I took the quiz
X+12y=68
x=8y-12
(8y-12) +12y=68
20y-12=68
20y=80
y=40
x=8(40)-12
x=320-12
x=308
Answer: Second Option
We know that the mean is:
and the standard deviation is:
We are looking at the percentage of students between 180 centimeters and 185 centimeters in height.
This is:
We calculate the Z-score using the formula:
For 
For 
Then we look at the normal table
Note: You can get the same conclusion using the empirical rule
Look at the attached image for 
